http://www.michiganextras.net/
http://www.motorcityflicks.com/

Here's a quote from to411daily.com:
"The Los Angeles region has seen a steady outflow of feature film
projects to other countries and states, about 40 of which now offer a
plethora of production rebates and tax breaks that aren't available in
California."

This may, however, be due to ongoing labor negotiations.

Tom